How many moles of oxygen molecules would be reduced from the decomposition of 2.5 moles of potassium trioxochloratc (V)?

• A) 2.50
• B) 3.50
• C) 3.75
• D) 2.50

In troposphere, the two types of pollutants are?

• A. Gaseous and particulate pollutants
• B. Carbon and metallic pollutants
• C. Natural and man-made pollutants
• D. Sulphuric and nitrogenous pollutants

An elements X with relative atomic mass 16.2 contains two isotopes¹⁶₈X with relative abundance of 90% and m8X with relative abundance of 10%. The value of m is

• A. 16
• B. 18
• C. 12
• D. 14

Chemical equilibrium is attained when

• A. All the reactants have been completely used up
• B. The reaction goes to completion
• C. The concentration of reactants and products remain constant
• D. The concentration of reactants and products are equal

The intermediate product formed when ethanol is progressively oxidized to ethanoic acid with potassium heptaoxodichromate (IV) is

• A. butanal
• B. ethanal
• C. methanal
• D. propanal

A sample of a gas may be identified as chlorine if it turns

• A. damp blue litmus paper red
• B. lime water miky
• C. lead ethanoate paper black
• D. starch iodide paper blue-black

The role of sodium chloride in the preparation of soap is to?

• A. purify the soap
• B. separate the soap from glycerol
• C. accelerate the decomposition of the fat or oil
• D. react with glycerol

How many moles of (H+) are there in 1 dm3 of 0.5 M solution of H₂SO₄?

• A. 2.0 moles
• B. 1.0 moles
• C. 0.5 mole
• D. 0.25 mole

Which of the following is physical change?

• A. Burning kerosene
• B. Freezing ice cream
• C. Exposing white phosphorus
• D. Dissolving calcium in water

The alkyl group is represented by the general formula

• A) CnH2n
• B) CnH2n − 2
• C) CnH2n + 1
• D) CnH2n + 2